Add to GroupKeyCreator \ Tools \ Non-Geometric \ Group \ Add-to-Group
Use this function to add entities to an existing group.
Using the Function:
Group – This setting creates one new group for each group that contains at least one selected entity. Each new group has the same subgroup structure as the original group, except that it does not contain empty subgroups.
Subgroup – This setting creates one new subgroup for each selected entity.
Entity – This setting un-groups all selected entities.